What is NOT a treatment method for solid radioactive waste?

Neutralization is indeed not typically considered a treatment method for solid radioactive waste. Treatment methods for solid radioactive waste are usually aimed at immobilizing the radioactivity, reducing volume, or stabilizing the waste to prevent it from leaching into the environment.

Landfill is a method of disposal for some low-level waste, where it is entombed in a specially engineered facility to isolate it from people and the environment. Vitrification involves converting waste into glass, which immobilizes the radionuclides and makes it stable for long-term storage. Encapsulation is a method that involves placing waste in a durable material, creating a barrier that limits the movement of radioactive elements.

Neutralization, on the other hand, is a process used primarily for hazardous chemical waste, where acids and bases are neutralized to a neutral pH. This method is not suitable for solid radioactive waste, which requires specific treatment techniques to ensure safety and containment. Hence, the focus on the permanence and security of radioactive waste makes it clear why neutralization does not fit as a treatment method in this context.